Bradley trailed by five strokes after making a triple bogey on the 15th hole and Dufner appeared to have the title wrapped up, but Bradley rallied and Dufner collapsed.

The leader put his tee shot in the water at 15, setting up the first of three straight bogeys. Bradley made birdies at 16 and 17, going to the final hole suddenly tied for the lead.

Both players made par on the 72nd hole, but Bradley won the playoff by a single stroke. He tapped in for par at the 18th hole and lifted the Wanamaker Trophy.

"I can't believe it," Bradley said.

In the playoff, Bradley made a 4-foot birdie at the 16th hole to gain the upper hand. Dufner nearly holed out from the fairway with his approach, then missed a 6-foot birdie try.

Bradley was in command when Dufner three-putted the 17th for a bogey, going to the final hole with a two-stroke edge. Dufner rolled in a 20-footer for birdie but it didn't matter. Bradley two-putted from 18 feet for the win, tapping into the final hole from about a foot away.

The players were tied at 8-under 272 at the end of regulation.

"A lot of experience to be gained from that," a dejected Dufner said.

The 25-year-old Bradley, the nephew of LPGA Hall of Fame member Pat Bradley, won the PGA in his very first appearance at a major championship. Dufner was denied his first tour win.

Going into the playoff, the U.S. was assured of breaking its longest drought of the modern era, having gone six straight majors without winning since Phil Mickelson captured the 2010 Masters.

Anders Hansen of Denmark closed with a 4-under 66, but finished one stroke out of the playoff at 273. Robert Karlsson of Sweden, David Toms and Scott Verplank tied for fourth at 275.